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van Brederode ME, van Mourik F, van Stokkum IH, Jones MR, van Grondelle R. Multiple pathways for ultrafast transduction of light energy in the photosynthetic reaction center of Rhodobacter sphaeroides. Proc Natl Acad Sci U S A 1999; 96:2054-9. [PMID: 10051593 PMCID: PMC26735 DOI: 10.1073/pnas.96.5.2054] [Citation(s) in RCA: 90] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A pathway of electron transfer is described that operates in the wild-type reaction center (RC) of the photosynthetic bacterium Rhodobacter sphaeroides. The pathway does not involve the excited state of the special pair dimer of bacteriochlorophylls (P*), but instead is driven by the excited state of the monomeric bacteriochlorophyll (BA*) present in the active branch of pigments along which electron transfer occurs. Pump-probe experiments were performed at 77 K on membrane-bound RCs by using different excitation wavelengths, to investigate the formation of the charge separated state P+HA-. In experiments in which P or BA was selectively excited at 880 nm or 796 nm, respectively, the formation of P+HA- was associated with similar time constants of 1.5 ps and 1. 7 ps. However, the spectral changes associated with the two time constants are very different. Global analysis of the transient spectra shows that a mixture of P+BA- and P* is formed in parallel from BA* on a subpicosecond time scale. In contrast, excitation of the inactive branch monomeric bacteriochlorophyll (BB) and the high exciton component of P (P+) resulted in electron transfer only after relaxation to P*. The multiple pathways for primary electron transfer in the bacterial RC are discussed with regard to the mechanism of charge separation in the RC of photosystem II from higher plants.
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Affiliation(s)
- M E van Brederode
- Faculty of Sciences, Vrije Universiteit, de Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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Vulto SIE, Neerken S, Louwe RJW, de Baat MA, Amesz J, Aartsma TJ. Excited-State Structure and Dynamics in FMO Antenna Complexes from Photosynthetic Green Sulfur Bacteria. J Phys Chem B 1998. [DOI: 10.1021/jp983003v] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simone I. E. Vulto
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Sieglinde Neerken
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Robert J. W. Louwe
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Michiel A. de Baat
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Jan Amesz
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Thijs J. Aartsma
- Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
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Streltsov AM, Vulto SIE, Shkuropatov AY, Hoff AJ, Aartsma TJ, Shuvalov VA. BA and BB Absorbance Perturbations Induced by Coherent Nuclear Motions in Reaction Centers from Rhodobacter sphaeroides upon 30-fs Excitation of the Primary Donor. J Phys Chem B 1998. [DOI: 10.1021/jp981514b] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. M. Streltsov
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
| | - S. I. E. Vulto
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
| | - A. Ya. Shkuropatov
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
| | - A. J. Hoff
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
| | - T. J. Aartsma
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
| | - V. A. Shuvalov
- Biophysics Department, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Laboratory of Photobiophysics, Belozersky Institute of Chemical and Physical Biology, Moscow State University, Moscow, 119899 Russia, and Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushino, Moscow regoin, 142292, Russia
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